9. Define rolling resistance.
10. Discuss coefficient of rolling resistance?
11. Analyze the coefficient of friction and express its relationship with angle of friction.
12. Illustrate the characteristics of general plane motion
13. Enumerate general plane motions with some examples.
14. Compare Co-efficient of friction and angle of friction
15. Describe coulomb’s laws of dry friction.
16. Define impending motion.
17. State angle of repose.
18. Could you explain Angular momentum?
19. How will you calculate the linear restoring force of an elastic material.
20. Define instantaneous centre of rotation.
Part – B (16 Marks)
1. Two blocks 'A' and 'B' of masses mA = 280 kg and mB = 420 kg are jointed by an
inextensible cable as shown in Fig. Assume that the pulley is frictionless and µ = 0.30
between block 'A' and the surface. The system is initially at rest. Determine (i) Acceleration
of block A (ii) velocity after it has moved 3.5 m and (iii) velocity after 1.5 seconds
2. A 10,000 kN train is accelerated at a constant rate up a 2% grade. The track resistance is
constant at 9N/kN. The velocity increases from 9m/sec to 18m/sec in a distance of 600 metres.
Determine the maximum power developed by the locomotive.
3. Determine the magnitude and the direction of the resultant of two forces 7 N and 8 N acting
at a point with an included angle of 60o with between them. The force of 7 N being horizontal
4. An effort of 200 N is required just to move a certain body up an inclined plane of angle
15°, the force is acting parallel to the plane. If the angle of inclination of the plane is
made 20°, the effort required being again parallel to the plane, is found to be 230 N.
Predict the weight of the body and coefficient of friction.
5. Two blocks A and B of mass 50 kg and 100 kg respectively are connected by a string C
which passes through a frictionless pulley connected with the fixed wall by another string D
as shown in figure. Find the force P required to pull the lock B. Also find the tension in the
string D. Take coefficient of friction at all contact surfaces as 0.3.